Andy's been busy and come up with a first cut layout, shown below! Yay! :-)
Which is good, because I've been busy too, emitting smoke, and slamming the speakers into oblivion briefly. Fortunately the speaker survived the excursion (literally, all the way out!).
The smoke was from some insulation tape I had covering some current limiter resistors that I (wisely) put on the rails. Unsure why it's drawing current and doing bad things. It might be time for me to learn some Kicad and make some changes to Andy's work myself, rather than being a lousy beggar bastard. I'll put my ideas in the next post for review.
Fred.